Debt - Schedule of Debt (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Short-term debt and current portion of long-term debt:
Short-term debt, weighted-average interest rate	0.00%	1.30%
Short-term debt	$ 0	$ 3,773,000
Current portion of long-term debt	305,759,000	32,511,000
Total short-term debt and current portion of long-term debt	305,759,000	36,284,000
Long-term debt:
Total before fair market value adjustment	5,434,903,000	4,722,016,000
Fair market value adjustment on notes subject to hedging	15,794,000	4,830,000
Total after fair market value adjustment	5,450,697,000	4,726,846,000
Current portion of long-term debt	(305,759,000)	(32,511,000)
Long-term debt	5,144,938,000	4,694,335,000
Total debt	5,450,697,000	4,730,619,000
Unamortized original issue discounts	8,000,000	7,900,000
Aggregate notional amount of interest rate swaps	$ 825,000,000	$ 600,000,000
U.S commercial paper [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	0.44%	0.35%
U.S. commercial paper	$ 461,414,000	$ 276,694,000
Global revolving credit facility [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	2.68%	1.60%
Global revolving credit facility	$ 43,553,000	$ 11,190,000
Unsecured U.S. notes - Medium-term notes [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	2.74%	3.29%
Unsecured U.S. notes - Medium-term notes	$ 4,112,089,000	$ 3,772,159,000
Unsecured U.S. obligations [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.51%	0.76%
Unsecured U.S. obligations	$ 50,000,000	$ 110,500,000
Unsecured foreign obligations [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.92%	2.01%
Unsecured foreign obligations	$ 283,433,000	$ 295,776,000
Asset-backed U.S. obligations [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.81%	1.81%
Unsecured foreign obligations	$ 448,331,000	$ 218,137,000
Capital lease obligations [Member]
Long-term debt:
Long-term debt, weighted-average interest rate	1.92%	1.73%
Capital lease obligations	$ 36,083,000	$ 37,560,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Represents adjustments in fair value of hedged debt obligations attributable to movements in benchmark interest rates. Hedge accounting required hedged debt instruments to be reported at an amount equal to the sum of their carrying value (principal value plus/minus premiums/discounts) and any fair value adjustment.

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Sum of the carrying values as of the balance sheet date of all long-term debt, including current portion, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, plus capital lease obligations due to be paid more than one year after the balance sheet date. Doesn't include fair market value adjustment on notes subject to hedging.

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Represents total long-term debt and capital lease obligations subsequent to fair market value adjustments on notes subject to hedging.

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Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis.

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Short-Term Debt And Current Portion Of Long-Term Debt [Abstract]

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), including current portion.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Weighted average interest rate of long-term debt outstanding.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding.

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